From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tejun Heo Subject: Re: [CALL-FOR-HELP] pata_ali: can't get MWDMA working! Date: Thu, 10 Jan 2008 10:49:33 +0900 Message-ID: <478579AD.2020301@gmail.com> References: <4784FBC1.7070804@gmail.com> <4785038D.1030503@rtr.ca> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Received: from rv-out-0910.google.com ([209.85.198.189]:59639 "EHLO rv-out-0910.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753381AbYAJBtm (ORCPT ); Wed, 9 Jan 2008 20:49:42 -0500 Received: by rv-out-0910.google.com with SMTP id k20so407850rvb.1 for ; Wed, 09 Jan 2008 17:49:39 -0800 (PST) In-Reply-To: <4785038D.1030503@rtr.ca> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Mark Lord Cc: Jeff Garzik , Alan Cox , IDE/ATA development list , andre@linux-ide.org, Bartlomiej Zolnierkiewicz Mark Lord wrote: > Are you really sure that the old IDE is actually issuing DMA commands, > rather than falling back to PIO ? Yeap, pretty sure. Here is debug dump of IDE transferring sector zero. [ 114.377898] XXX writing 0x8 to dma_cmd [ 114.381718] XXX read dma_stat 0x24 and writing 0x26 [ 114.386638] XXX writing feat=0x1 ireason=0 sector=0 cntl=0x0 cnth=0x80 ctrl=0x8 [ 114.393991] XXX executing WIN_PACKETCMD [ 114.397878] XXX CDB 28 00 00 00 00 00 00 00 01 00 00 00 [ 114.403899] XXX writing 0x8 | 1 to dma_command -- tejun